Home Page Researchers Shlomo Magdassi

Shlomo Magdassi

Institute of Chemistry
Faculty of Science
The Hebrew University, Jerusalem 91904, Israel
Tel: +972-2-6584967, Fax: +972-2-6584350
E-mail: magdassi@mail.huji.ac.il


Website:http://chem.ch.huji.ac.il/casali/magdassi/magdassi.htm

Synthesis and Applications of Nanomaterials

Our research was mainly focused on following topics:

  1. Preparation of dispersions of metal nanoparticles (NPs) and their use as conductive inks for printed electronics: solar cells, EL, RFID.
  2. Developing sintering process at room temperature for obtaining conductive patterns by metal NPs on heat-sensitive plastic substrates.
  3. Formation of transparent conductive coatings
  4. Preparation of functional organic NPs from nanodroplets, and their utilization in pharmaceutics, bio-imaging and cosmetics.
  5. Preparation of dispersions of carbon nanotubes and their utilization in solar cells and printed electronics.
  6. Formation of thermo-solar coatings for solar energy harvesting.

During recent years, we focused on preparation of stable aqueous dispersions of metal NPs and their use as conductive inkjet inks for printed electronics. We synthesized concentrated dispersions of Ag NPs, Cu NPs, and Cu/Ag core/shell NPs with a tunable shell thickness, which are stable in air. Achieving high electrical conductivity of printed metallic patterns such as in grids of solar cells, electrical circuits on heat sensitive plastic substrates for OLEDs and antennas for RFID, requires sintering of the metallic nanoparticles, which is usually achieved by heating to elevated temperatures. However, heating process limits the use of the metallic nanoparticles only for heat insensitive substrates, and therefore we developed new approaches for sintering metallic nanoparticles even at low temperatures. In addition, we also focused on formation of transparent conductive metal-based coatings, which can be applied as conductive grids for plastic electronics.

1. Metal NPs

1. Low temperature sintering of silver and copper NPs

Copper NPs are desired building blocks for low cost conductive inks since their conductivity is almost as high as that of silver (94%), while its cost is about 150 times cheaper (Figure 1). However, the spontaneous oxidation of copper and especially copper NPs while exposed to air present major challenges in the formation of copper conductive inks. Previously we reported the formation of copper-silver core-shell NPs which shows oxidation stability due to the formation of a silver protecting shell. Recently we demonstrated the formation of stable copper NPs inks by the addition of organic stabilizers to the printed ink. These inks are tailored to be sintered at temperatures lower than 200 oC in order to enable the formation of conductive patterns on plastic substrates. We continued as well the development of new sintering approaches for the sintering of metallic NPs, for example for silver NPs by plasma and microwave (Figure 2).

2. Sequential printing of silver ink and sintering ink

We presented a new approach combining sequential printing of two inks and chemical sintering mechanism. By printing a first layer of the silver NP ink and sequentially printing a sintering ink (Figure 3), we were able to obtain conductive patterns with a conductivity of 31% of bulk silver, while heating the substrate at low temperature of 600C. By changing parameters such as the number of printed layers, concentration and type of sintering agent, the conductivity of the printed pattern could be controlled. This method can be very useful in printed electronics where fast and low temperature sintering methods are needed.

Fig. 1: Copper NPs prepared by solution reduction process.

Fig. 2: Plasma and microwave sintered silver NPs and the formation of an nelectroluminescent device.

Fig. 3: Schematic illustration of the sequential printing method.n

2. Printing and Coatings of CNT ink

Aqueous and solvent based dispersions containing a high concentration of MWCNT and SWCNT were developed. The dispersions were used to form functional coatings such as low-reflective coatings and conductive transparent coatings. Conductive inks containing CNTs were also developed, and CNT electrodes were fabricated by inkjet printing. The electrodes were used in solar cells ,plastic light sensors and flexible electroluminescent (EL) devices.

3. Functional organic NPs for improving biological performance

Functional organic NPs with embedded or bound fluorescent probes and drugs were prepared. Three approaches were used for preparation of functional organic NPs:

  1. From nanoemulsions by low energy emulsification/solvent evaporation method.
  2. From microemulsions by solvent evaporation method
  3. By electrostatic binding of functional probe and oppositely charged polymeric NPs.
The following functional organic NPs were successfully prepared by the above new methods, for various applications:
  1. Polymeric NPs with bound Indocyanin Green (ICG), a near infrared fluorescent probe (NIR), which is capable of visualization of specific cells and tissues, for bio-medical imaging. In vivo experiments of these polymeric NP showed specific binding ability to colon tumors in mice.
  2. Water insoluble drugs showing significant improvement in biological activity and dissolution rate.
  3. Water insoluble pesticides, having improved dissolution rate and better biological performance compared to micron sized particles. Ecotoxicological studies of these pesticide NP showed that they are environmentally-friendly.

4. Thermosolar coatings

Solar coatings which are resistant to high temperatures while providing high spectral absorption were prepared. The coatings are composed of polymeric binders, nanometric absorbing materials ("pigments"), a liquid vehicle and additives. The polymeric binders transform into a ceramic network after prolonged heating at high temperature, and form a heat resistant matrix in which the pigment particles are embedded. The resulting coatings has high absorption and provides metal protection at high temperatures in air.

Our main achievements, in the thermo solar field are:

  • Developing high temperature solar coating for operation temperature range of 600-750 C, for various metal alloys.
  • Mid temperature solar selective coatings.
  • Synthesis of new absorbing nanoparticles for thermo solar coating.

Specific research topics related to Nanoscience and Nanotechnology:

  • Metal nanoparticles and conductive ink formulations: Metal nanoparticles. Core/shell metal nanoparticles. Sintering of metal nanoparticles at room temperature. Transparent conductive arrays of metal nanoparticles. Printing metallic nanoparticles in solar cells and plastic electronics.
  • Organic nanoparticles: Preparation of functional organic nanoparticles for diagnostics, bio-medical imaging and drug delivery.
  • Carbon nanotubes: Dispersions, ink formulations, application in solar cells and printed electronics.

List of publications in Nanoscience and Nanotechnology (2010-2012)

  • S. Magdassi, M. Grouchko, O. Berezin, and A. Kamyshny, Triggering the sintering of silver nanoparticles at room temperature, ACS Nano 4, 1943-1948 (2010).
  • K. Kravitz, A. Kamyshny, A. Gedanken, and S. Magdassi, Solid state synthesis of water-dispersible silicon nanoparticles from silica nanoparticles, J. Solid State Chem. 183, 1442-1447 (2010).
  • K. Margulis-Goshen, H. Donio (Netivi), D.T. Major, M. Gradzielski, U. Raviv, and S. Magdassi, Formation of organic nanoparticles from volatile microemulsions, J. Colloid Interface Sci. 342, 283-292 (2010).
  • L. Spernath and S, Magdassi, Formation of silica nanocapsules from nanoemulsions obtained by the phase inversion temperature method, Micro Nano Lett. 5, 28-36 (2010).
  • L.A. Aslanov, V.N. Zakharov, M.A Zakharov, A.L. Kamyshny, Sh. Magdassi, and A. Yatsenko, Stabilization of silicon nanoparticles by carbenes, Russ. J. Coord. Chem. 36, 330-332 (2010).
  • K. Margulis-Goshen, E. Kesslman, D. Danino and S. Magdassi, Formation of celecoxib nanoparticles from volatile microemulsions, Int. J Pharm. 393, 230-237 (2010).
  • S. Azoubel and S. Magdassi, The formation of carbon nanotube dispersions by high pressure homogenization and their rapid characterization by analytical centrifuge, Carbon 48, 3346-3352 (2010).
  • C.H. Anjali, S.S. Khan, K. Margulis-Goshen, S. Magdassi, A. Mukherjee, and N. Chandrasekaran, Formulation of water-dispersible nanopermethrin for larvicidal applications, Ecotoxicology and Environmental Safety 73, 1932-1936 (2010).
  • I. Levy, S. Magdassi, and D. Mandler, Potential induced pH change: towards electrochemical coating of medical implants by organic nanoparticles, Electrochim. Acta 55, 8590-8594 (2010).
  • L. Spernath and S. Magdassi, Polyurea nanocapsules obtained from nano-emulsions prepared by the phase inversion temperature method, Polym. Adv. Technol. Online available (2010).
  • A. Kamyshny, V. Zakharov, M. Zakharov, A. Yatsenko, S. Savilov, L. Aslanov, and S. Magdassi, Photoluminescent silicon nanocrystals stabilized by ionic liquid, J. Nanopart. Res. 13, 1971-1978 (2011).
  • E.V. Kudryashova, V.L. Bronza, A.A. Vinogradov, A. Kamyshny, S. Magdassi, and A.V. Levashov, Regulation of acid phosphatase in reverse micellar system by lipids additives: Structural aspects, J. Colloid Interface Sci. 353, 490-497 (2011).
  • E. Portnoy, S. Lecht, P. Lazarovici, D. Danino, S. Magdassi, Cetuximab-labeled liposomes containing near-infrared probe for in vivo imaging. Nanomedicine, Nanotechnology and Medicine, 7, 480-488 (2011).
  • L. Larush, S. Magdassi, Formation of near-infrared fluorescent nanoparticles for medical imaging. Nanomedicine 6, 233-240 (2011).
  • M. Layani, S. Magdassi, Flexible transparent conductive coatings by combining self assembly with sintering of silver nanoparticles performed at room temperature, J. Mater. Chem., 21, 15378-15382 (2011).
  • M. Grouchko, A. Kamyshny, D-F. Anghel, C.F. Mihailescu, and S. Magdassi, Conductive inks with ?built in? mechanism that enables sintering at room temperature. ACS Nano 5, 3354-3359 (2011).
  • Alexander Kamyshny, Joachim Steinke, and Shlomo Magdassi Metal-based Inkjet Inks for Printed Electronics, The Open Applied Physics Journal, 4, 19-36, (2011),
  • Katrin Margulis-Goshen, Bruno F. B. Silva, Eduardo F. Marques and Shlomo Magdassi. Formation of solid organic nanoparticles from a volatile catanionic microemulsion, Soft Matter, 7, 9359-9365. DOI: 10.1039/C1SM05637A,(2011)
  • S. Azoubel and S. Magdassi, Flexible electroluminescent device with inkjet printed carbon nanotube electrodes, Nanotechnology, 23, 344003 (2012)
  • J. Perelaer, R. Jani ,M. Grouchko, A. Kamyshny , S Magdassi and U. Schubert, Plasma and Microwave Flash Sintering of a Tailored Silver Nanoparticle Ink, Yielding 60% Bulk Conductivity on Cost-Effective Polymer Foils, Advanced Materials, 24,3993?3998,(2012)
  • Dvores, Michelle; Marom, Gad; Magdassi, Shlomo, Formation of organic nanoparticles by electrospinning of volatile microemulsions, Langmuir, 28,6978-84,(2012).
  • E. Tshuva, K. Margulis,I. Meker and S. Magdassi, High Antitumor Activity of Highly Resistant Salan Titanium(IV) Complexes in Nanoparticles: An Identified Active Species, Angewandte Chemie, DOI: 10.1002/anie.201207152
  • M. Layani , M. Grouchko , S. Shemesh and S. Magdassi Conductive patterns on plastic substrates by sequential inkjet printing of silver nanoparticles and electrolyte sintering solutions, J. Mater. Chem., 22, 14349-14352, (2012), DOI: 10.1039/C2JM32789A
  • R. S. S. Kumar , P. J. Shiny , C. H. Anjali , J. Jerobin , K. Margulis Goshen ,S. Magdassi , A. Mukherjee , N. Chandrasekaran , Distinctive effects of nano-sized permethrin in the environment, Environ Sci. Pollut. Res., DOI 10.1007/s11356-012-1161-0

Chapters in Books and Volumes

  1. S.Magdassi, M. Grouchko, and A. Kamyshny, Colloidal dispersion of metallic nanoparticles: formation and functional properties, in Structure and Functional Properties Colloidal Systems, Taylor&Francis, 339-365 (2010).
  2. A.Kamyshny and S.Magdassi, Aqueous Dispersions of metallic nanoparticles: formation, stabilization and application, in Nanoscience: Colloidal and Interfacial Aspects, Taylor&Francis, 747-778 (2010).
  3. S. Magdassi, M. Grouchko, and A. Kamyshny, Copper nanoparticles for printed electronics: routes towards achieving oxidation stability, Materials, 3, 4626-4638 (2010).
  4. S. Magdassi, Ink requirements and formulations guidelines, in The Chemistry of Inkjet Inks, World Scientific, 19-41 (2010).
  5. M. Ben-Moshe and S. Magdassi, Unique inkjet ink systems, in The Chemistry of Inkjet Inks, World Scientific, 203-221 (2010).
  6. A.Kamyshny, J. Steinke, and S. Magdassi, Metal-based inkjet inks for printed electronics, Open Appl. Phys. J. 4, 19-36 (2011).
  7. Margulis-Goshen, K and Magdassi S., Nanotechnology: an advanced approach to the development of potent insecticides in Advanced Technologies for Managing Insect Pests, chapter15, pp 295-314 (2012).

Five most significant publications:

  1. S. Magdassi, M. Grouchko, O. Berezin, and A. Kamyshny, Triggering the sintering of silver nanoparticles at room temperature, ACS Nano 4, 1943-1948 (2010)
  2. M. Grouchko, A. Kamyshny, D-F. Anghel, C.F. Mihailescu, and S. Magdassi, Conductive inks with "built in" mechanism that enables sintering at room temperature. ACS Nano 5, 3354-3359 (2011)
  3. L. Larush, S. Magdassi, Formation of near-infrared fluorescent nanoparticles for medical imaging. Nanomedicine 6, 233-240 (2011)
  4. E. Tshuva, K. Margulis,I. Meker and S. Magdassi, High Antitumor Activity of Highly Resistant Salan Titanium(IV) Complexes in Nanoparticles: An Identified Active Species, Angewandte Chemie, DOI: 10.1002/anie.201207152
  5. S. Azoubel and S. Magdassi, Flexible electroluminescent device with inkjet printed carbon nanotube electrodes, Nanotechnology, 23, 344003 (2012)

Patents and Patent Applications (2009-2012):

  • S. Magdassi, F. Kahana, and Y. Sela, Nanoemulsions with pseudoplastic behavior as carriers of cyclosporine, US 61/220,257 (2009).
  • S. Magdassi, M. Grouchko and A. Kamyshny, Aqueous dispersions of air stable core-shell metallic nanoparticles, 61074763US PCT, submitted (2009).
  • L. Shpernath, D. Avnir, and S. Magdassi Process for production of nanocapsules composed of silica shell and hydrophobic core, US Prov. 61/159,548 (2009).
  • M. Grouchko, A. Kamyshny, S. Magdassi, Obtaining conductive patterns by coagulation process at low temperatures, US Prov. 61/162,744 (2009).
  • L. Larush, E. Portnoy, P. Lazarovich, S. Lecht, and S. Magdassi, Preparation of FDA-approved NIR fluorescent nanoparticles for targeted in vitro, ex vivo, in situ and in vivo imaging applications, US Prov. 61/240,367 (2009).
  • M. Layani, M. Grouchko, and S. Magdassi, Transparent coatings for optoelectronic devices, US Prov. 61/257,139 (2009).
  • S. Magdassi, M. Grouchko, and A. Kamyshny, Core-shell metallic nanoparticles, methods of production thereof, and ink compositions containing the same, WO 2009/156990 A1 (2009).
  • S.Magdassi, A. Kamyshny, S. Aviezer, and M. Grouchko, Aqueous-based dispersions of metal nanoparticles, EP 1853673 B1 (2010).
  • S. Magdassi, M. Grouchko, and A. Kamyshny, Process for sintering nanoparticles at low temperatures, WO2010/109495 A1 (2010).
  • A. Zalsman, K. Margulis and S. Maggdassi, Compositions and methods for prevention and treatment of pulmonary hypertension, US Application 61/298224
  • S. Magdassi, G. Eron, Y. Vinetsky, Ink for ceramic surfaces, US patent 7,803,321 (2010).
  • S. Magdassi and B. Dayan, Pesticide nanoparticles obtained from microemulsions and nanoemulsions, US 2010/015236 (2010).
  • Michael layani, Shlomo Magdassi ,Flexible transparent conductive coatings by direct evaporative lithography performed at room temperature with silver nanoparticles US Prov. 2011, No. 61495110
  • S. Magdassi, D. Mandler, M. Beidussi and Rachel Assa, Solar-Radiation-Absorbing Formulation and Related Apparatus and Methods, US Prov. 2011

Cooperation with industry and defense projects (2010-2012):

  • Ministry of Defense: Dispersions of nanoparticles.
  • EU projects with industrial partners: NACBO, SkinTreat, SelectNano, and Lotus.
  • Ministry of Industry, Trade and Labor- Magnet programs :Medical imaging (BMP), Nanotubes Empowerment Solutions (NES), SES (Solar Energy Solutions).
  • Ministry of Science: Compositions and method for high temperature solar selective coatings.
  • Industry: Brightsource - Thermosolar caoting

Success Stories:

  • Glass inkjet inks: Licensed to DipTech, The product is already sold world wide.
  • Licensing: metal nanparticles production process , Thermosolar paint
  • Startup: Clear jet

Cooperation with other researchers/universities in Israel:

Within Hebrew University:
  • Prof. D. Mandler, Chemistry; Electrochemical coatings.
  • Prof. U. Banin, Institute of Chemistry; Q.D printing.
  • Prof. Y. Paltiel : Applied Physics
With other Universities:
  • Prof. Y Talmon, Technion; Characterization of nanomaterials.
  • Prof. D. Danino, Technion; Drug nanoparticles.

Research grants:

2 FP7 programs: Skintreat, Lotus, 3 Magnet programs(SES, NES, BMP), Ministry of Science :Thermosolar coatings, NRF (Singapore) :manomaterrials for energy management

Distinctions and awards:

The Enrique Berman Chair in Solar Energy

List of students, postdocs and researchers:

Scientific staff: Dr. Alexander Kamyshny, Dr. Y. Vinetsky, Dr. Liraz Larosh
PostDocs: Dr. Mubeen Baidossi
Ph.D. Students: Katy Margulis, Michael Grouchko, Suzanna Azoubel, Michael Layani, Emma Portnoy, Itamar Gofberg
M.Sc Students: Amir Shapira, Kobi Sudkov, Amani Zoabi, Dani Tulchinsky, Chani Mendelson, Ran Tivony, Lihi Levi, Viktorya Gordon


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